Development in processing of MgB2 cryo-magnet superconductors

Spark Plasma Sintering is a promising rapid consolidation technique that allows a better understanding and manipulating of sintering kinetics and therefore makes it possible to obtain MgB2-based ceramics with tailored microstructures. Commercial MgB2 powders were spark plasma sintered with an applie...

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Bibliographic Details
Published in:Journal of applied physics 2014-10, Vol.116 (16)
Main Authors: Noudem, J. G., Aburras, M., Bernstein, P., Chaud, X., Muralidhar, M., Murakami, M.
Format: Article
Language:English
Subjects:
Applied physics
Borides
Ceramic powders
Critical current density
Magnesium compounds
Plasma sintering
Spark plasma sintering
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Summary:Spark Plasma Sintering is a promising rapid consolidation technique that allows a better understanding and manipulating of sintering kinetics and therefore makes it possible to obtain MgB2-based ceramics with tailored microstructures. Commercial MgB2 powders were spark plasma sintered with an applied mechanical pressure, leading to MgB2 pellets with 99% relative density. The obtained samples show a sharp superconducting transition with an onset at 38.5 K. The critical current density was measured equal to 5.6 × 104 A/cm2 at 20 K under 1 T applied field. Otherwise, the trapped field was also investigated. A 5 mm thick pellet with a 20 mm diameter prepared with optimized processing temperature demonstrated a trapped field of 1.2 T at 15 K and up to 2.5 T at 10 K.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4900725